四线铁路钢箱混合梁弯斜拉桥设计研究
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摘要
根据四线铁路弯斜拉桥的受力特点,采用空间杆系有限元静力分析方法,围绕斜拉桥结构体系、桥梁整体刚度、收缩徐变、几何非线性等方面对其展开拉索、主梁、桥塔、基础的构造设计与研究。采用有限元仿真分析技术,研究正交异性桥面板的弯钢箱梁在受纵横向弯曲、剪力滞和扭转翘曲组合作用下的应力分布,进行钢箱梁与预应力混凝土梁的结合段、主梁与桥塔横梁固结、斜拉索上下钢锚箱的局部应力分析和构造研究。采用车桥耦合时变分析方法对其行车动力性能进行研究。采用反应谱及地震波时程分析方法同时对结构的抗震性能和抗震措施进行分析、研究。研究结果表明:四线铁路弯斜拉桥钢箱梁采用约3m的横隔板和腹板间距对改善主梁构造起到重要作用;良好的行车动力性能说明该桥采用1/900的挠跨比控制结构刚度较为合理;采用E型钢阻尼支座改善了桥梁的抗震性能。
According to the mechanical characteristics of the curve cable-stayed bridge of four-track railway,the structure design and research on the cable,girder,bridge towers and foundation construction were launched by space bar finite element static analysis method in terms of the cable-stayed bridge architecture,the bridge stiffness,shrinkage and creep,and geometric nonlinearity etc.FEM analysis was used to study the stress distribution of the orthotropic steel box decks under the combined effect of the vertical and horizontal bending,shear lag and torsion warping.With FEM simulation,the local stress analysis and structure research were carried out on several aspects,such as the joint section of steel box girder and the prestressed concrete beam,the consolidation area between the main girder and the crossbeam of the bridge tower as well as the upper and lower steel anchor boxes for stay cable.Vehicle-bridge coupled time-varying analysis method was adopted to study the train running dynamic performance.Response spectrum method and seismic time history analysis method were used to study and analyze the seismic performance and seismic measures of the structure.Analyses show that about 3 m distance between the diaphragm and the web plates adopted for the steel box girder plays important role in improving the main beam structure in the curve cable-stayed bridge of four-track railway.Good train operation performance indicates that 1/900 deflection-span ratio adopted for the bridge to control the structural stiffness is more reasonable.E-type steel damping bearing has improved the seismic performance of the bridge.
According to the mechanical characteristics of the curve cable-stayed bridge of four-track railway,the structure design and research on the cable,girder,bridge towers and foundation construction were launched by space bar finite element static analysis method in terms of the cable-stayed bridge architecture,the bridge stiffness,shrinkage and creep,and geometric nonlinearity etc.FEM analysis was used to study the stress distribution of the orthotropic steel box decks under the combined effect of the vertical and horizontal bending,shear lag and torsion warping.With FEM simulation,the local stress analysis and structure research were carried out on several aspects,such as the joint section of steel box girder and the prestressed concrete beam,the consolidation area between the main girder and the crossbeam of the bridge tower as well as the upper and lower steel anchor boxes for stay cable.Vehicle-bridge coupled time-varying analysis method was adopted to study the train running dynamic performance.Response spectrum method and seismic time history analysis method were used to study and analyze the seismic performance and seismic measures of the structure.Analyses show that about 3 m distance between the diaphragm and the web plates adopted for the steel box girder plays important role in improving the main beam structure in the curve cable-stayed bridge of four-track railway.Good train operation performance indicates that 1/900 deflection-span ratio adopted for the bridge to control the structural stiffness is more reasonable.E-type steel damping bearing has improved the seismic performance of the bridge.
引文
[1]荣振环,张玉玲,刘晓光.天兴州桥正交异性板焊接部位疲劳性能研究[J].中国铁道科学,2008,29(2):48-52.(RONG Zhenhuan,ZHANG Yuling,LIU Xiaoguang.Research on the Fatigue Performance of the Welded Joint ofthe Orthotropic Deck on Wuhan Tianxingzhou Bridge[J].China Railway Science,2008,29(2):48-52.in Chi-nese)
[2]胡建华,蒲怀仁.PBL剪力键钢混结合段设计与试验研究[J].钢结构,2007,2(22):62-68.(HU Jianhua,PU Huairen.Design and Test of the Joint Part of Steel-Concrete Girder Bridge With PBL Shear Con-nector[J].Steel Construction,2007,2(22):62-68.in Chinese)
[3]崔冰,孟凡超,赵灿辉,等.南京长江第三大桥主塔钢—混结合段设计研究[C]//中国公路学会桥梁和结构工程分会.2005年全国桥梁学术会议论文集.北京:人民交通出版社,2005:121-131.
[4]曾明根,苏庆田,邵长宇,等.公轨共用大跨斜拉桥索塔锚固区节段试验研究[J].中国铁道科学,2008,29(4):53-57.(ZENG Minggen,SU Qingtian,SHAO Changyu,et al.Test Study on the Cable-Pylon Anchorage Zone of Highwayand Light Railway Long-Span Cable-Stayed Bridge[J].China Railway Science,2008,29(4):53-57.in Chinese)
[5]陈开利.钢锚箱索塔锚固区受力机理[J].中国铁道科学,2008,29(4):58-64.(CHEN Kaili.Mechanical Mechanism of the Steel Anchor Housing in the Anchorage Zones of the Cable Pylons[J].China Railway Science,2008,29(4):58-64.in Chinese)
[6]何义斌.混凝土空心高墩温度效应研究[J].铁道科学与工程学报,2007,4(2):63-66.(HE Yibin.Temperature Effect of Hollow Concrete High Piers[J].Journal of Railway Science and Engineering,2007,4(2):63-66.in Chinese)
[7]卫星,李俊,强士中.扁平钢箱梁横隔板非线性稳定分析[J].中国铁道科学,2009,30(4):30-35.(WEI Xing,LI Jun,QIANG Shizhong.Nonlinear Stability Analysis on the Diaphragm Plate of Flat Steel Box Girder[J].China Railway Science,2009,30(4):30-35.in Chinese)
[8]布占宇,谢旭.不同阻尼计算模式对斜拉桥地震响应分析的影响[J].中国铁道科学,2006,27(2):46-51.(BU Zhanyu,XIE Xu.Effects of Different Damping Modes on the Seismic Response of Cable-Stayed Bridges[J].China Railway Science,2006,27(2):46-51.in Chinese)
[9]中南大学.东平水道特大斜拉桥动力特性及列车走行性分析报告[R].长沙:中南大学,2009.(Central South University.Dongping Waterway Dynamic Properties of Large Cable-Stayed Bridge and the Train Run-ning Performance Analysis[R].Changsha:Central South University,2009.in Chinese)
[10]熊建珍,高芒芒,俞翰斌.天兴洲长江大桥斜拉桥在地震作用下的车—桥耦合振动分析[J].中国铁道科学,2006,27(5):54-59.(XIONG Jianzhen,GAO Mangmang,YU Hanbin.Vehicle-Bridge Coupling Vibration Analysis of Cable-StayedBridge of Tianxingzhou Yangtze River Bridge under Earthquakes[J].China Railway Science,2006,27(5):54-59.in Chinese)
[2]胡建华,蒲怀仁.PBL剪力键钢混结合段设计与试验研究[J].钢结构,2007,2(22):62-68.(HU Jianhua,PU Huairen.Design and Test of the Joint Part of Steel-Concrete Girder Bridge With PBL Shear Con-nector[J].Steel Construction,2007,2(22):62-68.in Chinese)
[3]崔冰,孟凡超,赵灿辉,等.南京长江第三大桥主塔钢—混结合段设计研究[C]//中国公路学会桥梁和结构工程分会.2005年全国桥梁学术会议论文集.北京:人民交通出版社,2005:121-131.
[4]曾明根,苏庆田,邵长宇,等.公轨共用大跨斜拉桥索塔锚固区节段试验研究[J].中国铁道科学,2008,29(4):53-57.(ZENG Minggen,SU Qingtian,SHAO Changyu,et al.Test Study on the Cable-Pylon Anchorage Zone of Highwayand Light Railway Long-Span Cable-Stayed Bridge[J].China Railway Science,2008,29(4):53-57.in Chinese)
[5]陈开利.钢锚箱索塔锚固区受力机理[J].中国铁道科学,2008,29(4):58-64.(CHEN Kaili.Mechanical Mechanism of the Steel Anchor Housing in the Anchorage Zones of the Cable Pylons[J].China Railway Science,2008,29(4):58-64.in Chinese)
[6]何义斌.混凝土空心高墩温度效应研究[J].铁道科学与工程学报,2007,4(2):63-66.(HE Yibin.Temperature Effect of Hollow Concrete High Piers[J].Journal of Railway Science and Engineering,2007,4(2):63-66.in Chinese)
[7]卫星,李俊,强士中.扁平钢箱梁横隔板非线性稳定分析[J].中国铁道科学,2009,30(4):30-35.(WEI Xing,LI Jun,QIANG Shizhong.Nonlinear Stability Analysis on the Diaphragm Plate of Flat Steel Box Girder[J].China Railway Science,2009,30(4):30-35.in Chinese)
[8]布占宇,谢旭.不同阻尼计算模式对斜拉桥地震响应分析的影响[J].中国铁道科学,2006,27(2):46-51.(BU Zhanyu,XIE Xu.Effects of Different Damping Modes on the Seismic Response of Cable-Stayed Bridges[J].China Railway Science,2006,27(2):46-51.in Chinese)
[9]中南大学.东平水道特大斜拉桥动力特性及列车走行性分析报告[R].长沙:中南大学,2009.(Central South University.Dongping Waterway Dynamic Properties of Large Cable-Stayed Bridge and the Train Run-ning Performance Analysis[R].Changsha:Central South University,2009.in Chinese)
[10]熊建珍,高芒芒,俞翰斌.天兴洲长江大桥斜拉桥在地震作用下的车—桥耦合振动分析[J].中国铁道科学,2006,27(5):54-59.(XIONG Jianzhen,GAO Mangmang,YU Hanbin.Vehicle-Bridge Coupling Vibration Analysis of Cable-StayedBridge of Tianxingzhou Yangtze River Bridge under Earthquakes[J].China Railway Science,2006,27(5):54-59.in Chinese)
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